Create 7z Files Online
Add multiple files and create a 7z archive with superior LZMA2 compression — all in your browser.
Drop files here or click to browse
Add multiple files to create a 7z archive
Create 7z archives with superior LZMA2 compression
Three compression levels: Store, Normal, and Maximum
Drag-and-drop or file picker — add files easily
100% client-side — files never leave your device
Better compression ratios than ZIP in most cases
No watermarks, no sign-up required
Frequently Asked Questions
What is a 7z file?
7z is an archive format from the 7-Zip project. It uses LZMA2 compression which typically achieves 30–70% better compression ratios than ZIP's DEFLATE algorithm, resulting in smaller files.
How does 7z compare to ZIP?
7z generally produces smaller archives than ZIP thanks to LZMA2 compression. However, ZIP is more universally supported. Use 7z when you need maximum compression; use ZIP when compatibility matters.
Can anyone open a 7z file?
7z files can be opened with 7-Zip (free, Windows/Linux), WinRAR, PeaZip, and most modern archive managers. macOS users can use The Unarchiver or Keka.
Is there a file size limit?
There are no artificial limits. Since processing happens in your browser, very large files may be slow or constrained by browser memory. For best results, keep total file size under 500MB.
Are my files safe?
Yes. Everything runs in your browser using WebAssembly — your files are never uploaded to any server. Your data stays completely private.
How long does compression take?
It depends on file size and compression level. Normal level is fast for most files. Maximum level takes longer but produces the smallest archives. Store is instant as it skips compression.